Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein__________ .

 A. Binds with epithelial cells of mid-gut of the insect pest ultimately killing it

 B. Is coded by several genes including the gene cry

C. Is activated by acid pH of the foregut of the insect pest

D. Does not kill the carrier bacterium, which is itself resistance to its toxin

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